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Western Electric 568HT

Common battery operation on either 2-wire or 4-wire lines.

2002 paulf.  All rights reserved.
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Marked 568HT+  5-62

(TouchTone sets after the formal TouchTone announcement in 1964 were marked with a "1" prefix.  e.g. 1565.)

WE 568HT and spare dial pad
TouchTone dial with P and SG keys for 4-wire use.
  P = Priority
  SG =  Special Grade

Buttons were typically assigned as follows:
   4-wire line 1
   4-wire line 2
   2-wire line
   Auxiliary Transfer Key
   Transfer Key

There is also an exclusion key under the left plunger.
Button Detail
Note the key profile.  The spherical detent in the middle of each button is smaller than the later production buttons.

The designation strip covers are beveled and held in place with pins, like those on the earlier 400-series keysets and late 1950s vintage prototype sets.  The pins go into a metal plate that the dial pad is mounted on -- a much more expensive arrangement than that used by later keysets and TouchTone pads.
Inside view
Side veiw shows the 4-wire relay (above the ringer coil) and additional terminal strip.

The relay disconnects the receiver from the network.  A repeating coil matches the receiver to the receiving loop, to obtain a 4-wire termination.
Back of dial
Back view of the 22A TouchTone pad.  Each button push produces two tones.

BSP  C38.595.06, Issue 1, June 1961 identifies the frequencies generated as:
   Columns:  1209, 1336 and 1477 cps
   Rows:  697, 770, 852 and 941 cps.

   (Standard TouchTone frequencies.)

The BSP specifies set availability in black only.

Go to the reference table for the 568HT

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2002 paulf.  All rights reserved.